// This file is part of Substrate.

// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! This fixture calls the `ownCodeHash` function on the
//! `System` pre-compile.

#![allow(unused_imports)]
#![no_std]
#![no_main]
include!("../panic_handler.rs");

use core::num::NonZero;
use uapi::{HostFn, HostFnImpl as api, u256_bytes};
use hex_literal::hex;

#[no_mangle]
#[polkavm_derive::polkavm_export]
pub extern "C" fn deploy() { }

#[no_mangle]
#[polkavm_derive::polkavm_export]
pub extern "C" fn call() {
	let mut output_buf = [0u8; 32];
	let output = &mut &mut output_buf[..];
	let _ = api::call(
		uapi::CallFlags::READ_ONLY,
		&uapi::SYSTEM_PRECOMPILE_ADDR,
		u64::MAX,       // How much ref_time to devote for the execution. u64::MAX = use all.
		u64::MAX,       // How much proof_size to devote for the execution. u64::MAX = use all.
		&[u8::MAX; 32], // No deposit limit.
		&[0u8; 32],     // Value transferred to the contract.
		&uapi::solidity_selector("ownCodeHash()"),
		Some(output),
	).unwrap();
	assert_ne!(output_buf, [0u8; 32]);
	api::return_value(uapi::ReturnFlags::empty(), &output_buf);
}
